Periodic Table

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Across
  1. 7. – Another word for a group of elements with similar properties
  2. 9. – Type of electron that determines reactivity
  3. 12. – A pure substance made of only one type of atom
  4. 13. – Group 18; full outer shell, inert
  5. 15. – Horizontal rows on the periodic table
  6. 16. (Mixed Types)
  7. 17. – These metals span Groups 3–12
  8. 18. – One or two letters that represent an element
  9. 20. – Series of elements known as rare earth metals
  10. 21. – Group 1 elements known for being highly reactive with water
Down
  1. 1. – Group of radioactive elements often found below the main table
  2. 2. – Unique number of protons in an element
  3. 3. – Group 17 elements that form salts with metals
  4. 4. – Tendency of an atom to attract electrons in a bond
  5. 5. – Russian chemist who arranged elements by atomic mass and predicted undiscovered ones
  6. 6. – Organizes elements by increasing atomic number
  7. 8. – The current version of the periodic table is called the _____ periodic table
  8. 10. – Elements with properties of both metals and nonmetals
  9. 11. – A measure of how easily an element forms compounds
  10. 14. – Vertical columns on the periodic table
  11. 19. – Scientist who discovered atomic number as the organizing principle